What is the meaning of mewling and puking?

"Mewling and puking" is a phrase from Shakespeare's play "As You Like It," describing the early stages of human life. It refers to the sounds made by an infant (mewling) and the act of spitting up or vomiting (puking). Together, these terms evoke the helplessness and vulnerability of babies, highlighting the more chaotic aspects of human existence. The phrase is often used to illustrate the journey of life from infancy to adulthood.